The equinox happens twice a year in our year-long trip around the Sun. In the Northern Hemisphere, it's the FirstDayofFall. In the Southern Hemisphere, spring is here! More:
In meteorology, the fall season begins on Sept. 1, however, the September equinox gives us the green light to welcome the astronomical fall season in the Northern Hemisphere . This happens Sept. 22, 2021, at 19:21 UTC,An illustration of the March and September equinoxes. During the equinoxes, both hemispheres receive equal amounts of daylight. Credit: NASA/JPL-Caltech
Along with marking the beginning of astronomical fall, the Sun will be exactly above Earth’s equator, moving from north to south, making day and night nearly equal in length – about 12 hours – throughout the world. At the North Pole, over the upcoming days, the Sun will sink below the horizon for a kind of twilight from now until sometime in October when it will be completely dark, according to NASA solar scientist Mitzi Adams. Spring twilight at the North Pole begins a few weeks before the vernal, or spring, equinox in March, when the Sun rises above the horizon again.
This only happens twice in Earth’s year-long trip around the Sun. The rest of the year, the Sun shines unevenly over the Northern and Southern Hemispheres. That’s because Earth’s axis is tilted with respect to the Sun-Earth plane. But on these special days – the spring and fall equinoxes – the Sun shines almost equally on the Northern and Southern hemispheres.In the Northern hemisphere, the September equinox marks the start of a period bringing us later sunrises and earlier sunsets.
Today, we celebrate the equinox as an astronomical event caused by Earth’s tilt on its axis and its motion in orbit around the Sun.
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